the microscope. the history many people experimented with making microscopes the first microscope...
DESCRIPTION
The History Hans and Zacharias Janssen of Holland in the 1590’s created the “first” compound microscope Anthony van Leeuwenhoek and Robert Hooke made improvements by working on the lenses Anthony van Leeuwenhoek Robert Hooke Hooke MicroscopeTRANSCRIPT
The Microscope
The History• Many people experimented with making
microscopes
• The first microscope was originally made by accident (Most people were creating telescopes)
• The first microscope was 6 feet long!!!
• The Greeks & Romans used “lenses” to magnify objects over 1000 years ago.
The History• Hans and Zacharias Janssen of Holland
in the 1590’s created the “first” compound microscope
• Anthony van Leeuwenhoek and Robert Hooke made improvements by working on the lenses
Anthony van Leeuwenhoek1632-1723
Robert Hooke 1635-1703
Hooke Microscope
The History
Zacharias Jansen1588-1631
The “First” Microscope
How a Microscope WorksConvex Lenses arecurved glass used to make microscopes(and glasses etc.)
Convex Lenses bendlight and focus it inone spot.
How a Microscope WorksOcular Lens(Magnifies Image)
Objective Lens(Gathers Light, Magnifies And Focuses Image Inside Body Tube)Body Tube
(Image Focuses)
•Bending Light: The objective (bottom) convex lens magnifies and focuses (bends) the image inside the body tube and the ocular convex (top) lens of a microscope magnifies it (again).
The Parts of a Microscope
Body Tube
Nose Piece
ObjectiveLenses
Stage Clips
Diaphragm
Light Source
Ocular Lens
Arm
Stage
Coarse Adj.
Fine Adjustment
Base
Skip to Magnification Section
Body Tube• The body tube holds the objective
lenses and the ocular lens at the proper distance
Diagram
Nose Piece• The Nose Piece holds the objective
lenses and can be turned to increase the magnification
Diagram
Objective Lenses• The Objective Lenses increase
magnification (4X, 10X, and 40X)
Diagram
Stage Clips• These 2 clips hold the slide/specimen in
place on the stage.
Diagram
Diaphragm• The Diaphragm controls the amount of
light on the slide/specimen
Turn to let more light in or tomake dimmer.
Diagram
Light Source• Projects light upwards through the
diaphragm, the specimen and the lenses
• Some have lights, others have mirrors where you must move the mirror to reflect light
Diagram
Ocular Lens/Eyepiece• Magnifies the specimen image (10x)
Diagram
Arm• Used to support the microscope when
carried. Holds the body tube, nose piece and objective lenses
Diagram
Stage• Supports the slide/specimen
Diagram
Coarse Adjustment Knob• Moves the stage up and down (quickly)
for focusing your image (Bigger knob)
Diagram
Fine Adjustment Knob• This knob moves the stage SLIGHTLY
to sharpen the image (smaller knob)
Diagram
Base• Supports the microscope
Diagram
Magnification
Magnification• To determine your magnification…you
just multiply the ocular lens by the objective lens
• Ocular 10x Objective 40x:10 x 40 = 400
Objective Lens have their magnificationwritten on them.
Ocular lenses usually magnifies by 10x
So the object is 400 times “larger”
Caring for a Microscope
• Carry it with 2 HANDS…one on the arm and the other on the base
• When focusing the microscope always start with the lowest powered objective lens
• When on high power, NEVER use the coarse adjustment knob
Carry a Microscope Correctly
Using a Microscope• Start on the lowest magnification• Turn on and adjust the light source• Use Coarse adjustment to find the
image• Use fine adjustment to focus• Repeat with more magnification